Chapter 32 An Introduction to Animal Diversity

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Chapter 32 An Introduction to Animal Diversity. What is an animal? Multicellular, heterotrophic eukaryote – ingestion Structural support from structural proteins – NOT cell walls Nervous tissue & muscle tissue for impulse conduction & movement - PowerPoint PPT Presentation

Text of Chapter 32 An Introduction to Animal Diversity

  • Chapter 32 An Introduction to Animal DiversityWhat is an animal?Multicellular, heterotrophic eukaryote ingestionStructural support from structural proteins NOT cell wallsNervous tissue & muscle tissue for impulse conduction & movementSexual reproduction with motile sperm swimming to non-motile eggHow did animals evolve?- Current animal development

  • Figure 32.2 Early embryonic development in animals (layer 1)Cleavage cell division w/out cytokinesis- More cells but same total volume no cell growth

  • Figure 32.2 Early embryonic development in animals (layer 2)Blastula hollow ball of cells-coel opening or cavity

  • Figure 32.2 Early embryonic development in animals (layer 3)Ectoderm outside layerEndoderm inside layerGastrulation movement of cells to form 2 layersBlastopore opening where cells move into

  • Chapter 32 An Introduction to Animal DiversityWhat is an animal?Multicellular, heterotrophic eukaryote ingestionStructural support from structural proteins NOT cell wallsNervous tissue & muscle tissue for impulse conduction & movementSexual reproduction with motile sperm swimming to non-motile eggHow did animals evolve?Current animal developmentCurrent hypothesis

  • Figure 32.4 One hypothesis for the origin of animals from a flagellated protist

  • Chapter 32 An Introduction to Animal DiversityWhat is an animal?How did animals evolve?How are animals grouped & characterized?Body plansSymmetryNone (sponge) Radial multiple central axis cuts provide mirror imagesOnly have top & bottomBilateralOnly 1 central axis cut provides a mirror imageHas top, bottom, left & right

  • H-W LabAll 6 sectionsPersonal AcctData for all 3 Cases including NEW p & qDiscussion questions for all 3 Cases6 practice problems at the endNot Exercise 8A or Case IV

    Protist ID Lab-All 6 sections-Pre-lab from in-class notes-Personal acct-include characteristics that you keyed out-name of organism-drawing of organism

  • Chapter 32 An Introduction to Animal DiversityWhat is an animal?How did animals evolve?How are animals grouped & characterized?Body plansSymmetry & TISSUESNone (sponge) Radial multiple central axis cuts provide mirror imagesOnly have top & bottomDiploblastic 2 cell layersEctoderm Endoderm BilateralOnly 1 central axis cut provides a mirror imageHas top, bottom, left & rightTriploblastic 3 cell layersEctoderm & endodermMesoderm in between ecto- & endodermCephalization movement of sensory equipment towards the anterior end of the organism associated with movement

  • Chapter 32 An Introduction to Animal DiversityWhat is an animal?How did animals evolve?How are animals grouped & characterized?Body plansSymmetry & tissues Body cavitiesAcoelomates without a body cavityPseudocoelomates false body cavity cavity not completelylined with tissue derived from mesodermCoelomates body cavity completely lined with tissue from mesoderm

  • Figure 32.8 Body plans of triploblastic animals

  • Chapter 32 An Introduction to Animal DiversityWhat is an animal?How did animals evolve?How are animals grouped & characterized?Body plansSymmetry & tissues Body cavitiesDevelopmental planProtostomeDeuterostome

  • Figure 32.9 A comparison of protostome and deuterostome development

  • Figure 32.10 One hypothesis of animal phylogeny based mainly on morphological and developmental comparisons

  • Figure 32.11 One hypothesis of animal phylogeny based mainly on molecular data

  • Figure 32.12 EcdysisEcdysozoa secrete an exoskeleton and moltNematoda & Arthropoda

  • Figure 32.13 Characteristics of lophotrochozoans

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